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p2pClient.java
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import java.io.*;
import java.net.*;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.*;
import java.util.stream.Collectors;
public class p2pClient {
public static ArrayList<String> clients = new ArrayList<>();
private static ArrayList<String> neighbours = new ArrayList<>();
public static ArrayList<Socket> neighborSockets = new ArrayList<>();
public static ArrayList<String> messageIP = new ArrayList<>();
public static ArrayList<p2pSearchObjectBerkley> searchObjects = new ArrayList<>();
public static HashMap<Integer, String> searchWithMessageTransfer = new HashMap<>();
public static HashMap<String, String> fileTags = new HashMap<>();
public static ArrayList<String> berkleyList = new ArrayList<>();
public static ArrayList<String> actualFiles = new ArrayList<>();
public static long berkleyStart;
public static long berkleyEnd;
private static int ID;
private static int IDCounter = 1;
private static boolean FLAG_Message = false;
private static String message;
private static boolean FLAG_Search = false;
private static boolean FLAG_SyncStart = false;
private static boolean FLAG_Networking = false;
public static int electionCounter = 0;
public static int highestElectID = -1;
public static String FLAG_State = "";
private static String tmpReceived = "";
public static boolean FLAG_Election_started = false;
public static boolean FLAG_Berkley_started = false;
public static String LeaderMessage = "";
private static Timer timer = new Timer();
private static Timer BerkleyTimer = new Timer();
private static Timer networkingTimer = new Timer();
private static boolean FLAG_Networking_Timer = false;
private static String hostname;
private static TimerTask timerTask;
private static TimerTask networkingTimerTask;
private static LocalTime systemTime;
/**
* Parameters to change
*/
public static final int TCP_PORT = 1337; //Port to change
public static String path = "/PATH/FILE.dat"; //path to leader entry file
public static final int TIME_TO_LIVE = 8; //TimeToLive
public static Thread t2 = new Thread() {
public void run() {
try {
peerTCPServer(hostname, TCP_PORT);
} catch (Exception e) {
System.out.println("ERROR: " + e.getMessage());
DateFormat dateFormat = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
Date date = new Date();
System.out.println("[" + dateFormat.format(date) + "] The address" + hostname + ":" + TCP_PORT + " could not establish a connection!");
System.out.println("ERROR: " + e.getMessage());
}
}
};
public static void main(String[] argv) throws Exception {
showCredits();
hostname = InetAddress.getLocalHost().getHostAddress();
System.out.println(hostname);
connecting(hostname, TCP_PORT);
//BerkleyTimer
Thread t1 = new Thread() {
@Override
public void run() {
while (true) {
try {
systemTime = systemTime.plusSeconds(1);
Thread.sleep(998);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
};
t1.start();
Thread t4 = new Thread() {
@Override
public void run() {
try {
sendRequest(hostname, TCP_PORT);
} catch (Exception e) {
System.out.println("ERROR: " + e.getMessage());
DateFormat dateFormat = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
Date date = new Date();
System.out.println("[" + dateFormat.format(date) + "] The address " + hostname + ":" + TCP_PORT + "could not establish a connection! n");
System.out.println("ERROR: " + e.getMessage());
}
}
};
t2.start();
t4.start();
Thread newNeighbor = new Thread() {
@Override
public void run() {
for (int i = 0; i < neighborSockets.size(); i++) {
if (!neighborSockets.get(i).isClosed()) {
if (neighborSockets.size() < 1) {
printMessage("INFO: new neighbour requested!");
connecting(hostname, TCP_PORT);
}
}
}
}
};
newNeighbor.start();
}
public synchronized static void berkley(int ttl) throws IOException {
berkleyStart = systemTime.toNanoOfDay();
DateTimeFormatter dtf = DateTimeFormatter.ofPattern("HH:mm:ss");
sendBerkleyNeighbor(hostname, TCP_PORT, ttl, null, systemTime.format(dtf));
if (!FLAG_Berkley_started) {
FLAG_Berkley_started = true;
BerkleyTimer.schedule(new TimerTask() {
@Override
public void run() {
berkleyEnd = systemTime.toNanoOfDay();
//long timeIsGone = berkleyEnd - berkleyStart;
LocalTime difference = LocalTime.parse("00:00:00.000000");
for (String s : berkleyList) {
LocalTime time = LocalTime.parse(s.split("-")[1]);
difference = difference.plusHours(time.getHour());
difference = difference.plusMinutes(time.getMinute());
difference = difference.plusSeconds(time.getSecond());
}
LocalTime avg = LocalTime.parse(difference.format(DateTimeFormatter.ofPattern("HH:mm:ss")));
int hour = avg.getHour() / (berkleyList.size() + 1);
int minute = avg.getMinute() / (berkleyList.size() + 1);
int second = avg.getSecond() / (berkleyList.size() + 1);
avg = LocalTime.parse((hour <= 9 ? "0" + hour : hour) + ":"
+ (minute <= 9 ? "0" + minute : minute) + ":" +
(second <= 9 ? "0" + second : second));
avg = avg.minusHours(7);
systemTime = systemTime.plusHours(avg.getHour());
systemTime = systemTime.plusMinutes(avg.getMinute());
systemTime = systemTime.plusSeconds(avg.getSecond());
for (String s : berkleyList) {
try {
Socket socket = new Socket(s.split("-")[0].split(":")[0], Integer.parseInt(s.split("-")[0].split(":")[1]));
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
LocalTime deviation = LocalTime.parse(s.split("-")[1]);
LocalTime initial = LocalTime.parse("00:00:00");
//24:00:00 - Deviation that was mentioned
LocalTime secondDifference = initial.minusSeconds(deviation.getSecond());
LocalTime minuteDifference = secondDifference.minusMinutes(deviation.getMinute());
LocalTime hoursDifference = minuteDifference.minusHours(deviation.getHour());
//Special case when time is running out
if (Boolean.parseBoolean(s.split("-")[2])) {
LocalTime secondMinus = hoursDifference.plusSeconds(2 * deviation.getSecond());
LocalTime minuteMinus = secondMinus.plusMinutes(2 * deviation.getMinute());
hoursDifference = minuteMinus.plusHours(2 * deviation.getHour());
}
//Add up Avg Time
LocalTime secondPlus = hoursDifference.plusSeconds(avg.getSecond());
LocalTime minutePlus = secondPlus.plusMinutes((avg.getMinute()));
LocalTime hourPlus = minutePlus.plusHours(avg.getHour());
dos.writeBytes("152-" + hourPlus.format(DateTimeFormatter.ofPattern("HH:mm:ss")) + "\n");
dos.flush();
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
printMessage("--------------------");
printMessage("Local time is now " + systemTime + "!");
printMessage("(change by " + avg + " Time units)");
printMessage("--------------------");
berkleyList.clear();
FLAG_Berkley_started = false;
}
}, 5000);
}
}
public static synchronized void sendBerkleyNeighbor(String hostname, int port, int ttl, Socket clientSocket, String systemTime) throws IOException {
if (ttl > 0) {
for (Socket neighborSocket : neighborSockets) {
if (!neighborSocket.isClosed()) {
if (clientSocket == null || (!neighborSocket.getInetAddress().equals(clientSocket.getInetAddress()) && !(neighborSocket.getPort() == (clientSocket.getPort())))) {
DataOutputStream outToServer = new DataOutputStream(neighborSocket.getOutputStream());
outToServer.writeBytes("150-" + hostname + ":" + port + "-" + systemTime + "-" + ttl + '\n');
outToServer.flush();
} else {
if (!neighborSocket.getInetAddress().equals(clientSocket.getInetAddress()) && neighborSocket.getPort() != clientSocket.getPort()) {
DataOutputStream outToServer = new DataOutputStream(neighborSocket.getOutputStream());
outToServer.writeBytes("150-" + neighborSocket.getInetAddress() + ":" + neighborSocket.getPort() + "-" + systemTime + "-" + ttl + '\n');
outToServer.flush();
}
}
}
}
}
}
/**
* Rendering a console output with TimeStamp
*
* @param msg Message to be logged
*/
public synchronized static void printMessage(String msg) {
DateFormat dateFormat = new SimpleDateFormat("dd.MM.yyyy HH:mm:ss");
Date date = new Date();
System.out.println("[" + dateFormat.format(date.getTime()) + "] " + msg);
}
/**
* Execute the Connect and enter the neighbors!
*
* @param hostname the client hostname
* @param tcpPort the client port
*/
public synchronized static void connecting(String hostname, int tcpPort) {
systemTime = LocalTime.now();
printMessage("Read file");
try {
ArrayList<String> leaderList = peerReadFile();
if (leaderList.size() == 0 || leaderList.get(0).equals("") || leaderList.get(0).equals(" ")) {
String leading = "" + hostname + ":" + tcpPort + "";
BufferedWriter writer = new BufferedWriter(new FileWriter(path));
writer.write(leading);
writer.newLine();
writer.close();
printMessage("a new leader has been appointed! (" + leading + ")");
clients.add(hostname + ":" + tcpPort);
ID = 0;
} else {
printMessage("File was read out.");
String leaderlessHostname = leaderList.get(0).split(":")[0];
int leaderListPort = Integer.parseInt(leaderList.get(0).split(":")[1]);
for (int i = 0; i < leaderList.size(); i++) {
printMessage("Client inquired: " + leaderList.get(i));
if (!leaderList.get(i).split(":")[0].equals(hostname) || Integer.parseInt(leaderList.get(i).split(":")[1]) != tcpPort) {
try {
Socket clientSocket = new Socket(leaderlessHostname, leaderListPort);
DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream());
outToServer.writeBytes("01-" + hostname + ":" + tcpPort + '\n');
outToServer.flush();
String modifiedSentence = new BufferedReader(new InputStreamReader(new DataInputStream(clientSocket.getInputStream()))).readLine();
printMessage("FROM SERVER: " + modifiedSentence);
if (modifiedSentence.startsWith("02-")) {
StringBuilder msg = new StringBuilder("INFO: Your neighbors are: ");
String[] s = modifiedSentence.split("-");
ID = Integer.parseInt(s[1]);
System.out.println("ID: " + ID);
clientSocket.close();
for (int j = 2; j < s.length; j++) {
FLAG_State = "Connecting";
if (!s[j].startsWith("0.0.0.0:")) {
boolean isAlreadyListed = false;
for (int k = 0; k < neighbours.size(); k++) {
if (s[k].equals(neighbours.get(k))) {
isAlreadyListed = true;
break;
}
}
if (!isAlreadyListed) {
neighbours.add(s[j]);
msg.append(s[j]).append(", ");
try {
Socket socket = new Socket(s[j].split(":")[0], Integer.parseInt(s[j].split(":")[1]));
neighborSockets.add(socket);
DataOutputStream outToNeighbor = new DataOutputStream(socket.getOutputStream());
DataInputStream inFromNeighbour = new DataInputStream(socket.getInputStream());
outToNeighbor.writeBytes("200\n");
outToNeighbor.flush();
String res = new BufferedReader(new InputStreamReader(new DataInputStream(socket.getInputStream()))).readLine();
if (res.length() > 0) {
System.out.println(res);
}
Thread t1 = new Thread(() -> listenToServerRequest(socket, outToNeighbor, inFromNeighbour, tcpPort, hostname));
printMessage("Connected and added!");
t1.start();
} catch (Exception e) {
printMessage(e.getMessage());
}
}
}
}
printMessage(msg.toString());
}
} catch (IOException e) {
printMessage("Timeout reached!!! for the client " + leaderList.get(i));
removeFromFile(leaderList.get(i));
leaderList.remove(i);
}
} else {
printMessage("You are already a leader");
clients.add(hostname + ":" + tcpPort);
ID = 0;
}
}
//set yourself as a leader
if (leaderList.size() == 0) {
setLeaderToList(hostname, tcpPort);
String actLeader = peerReadFile().get(0);
if (actLeader.equals(hostname + ":" + tcpPort)) {
ID = 0;
} else {
ID = -1;
}
}
}
try {
Thread.sleep(1000);
if (ID > 0 && neighbours.size() == 0) {
connecting(hostname, tcpPort);
}
} catch (InterruptedException e) {
e.printStackTrace();
}
} catch (Exception e) {
printMessage("The file contains no contents!");
}
if (ID > 0 && neighbours.size() == 0) {
connecting(hostname, tcpPort);
}
}
/**
* Writes this client as leader in the list
*
* @param hostname the client hostname
* @param tcpPort the client Port
*/
public synchronized static void setLeaderToList(String hostname, int tcpPort) {
String actualLeader = "";
try {
if (!(hostname + ":" + tcpPort).equals(actualLeader)) {
String leading = hostname + ":" + tcpPort;
BufferedWriter writer = new BufferedWriter(new FileWriter(path));
writer.write(leading);
writer.newLine();
writer.close();
printMessage("a new leader has been appointed! (" + leading + ")");
clients.add(hostname + ":" + tcpPort);
}
} catch (Exception e) {
printMessage("Leader could not be set!");
}
}
/**
* TCP server of the client listens for messages and connections.
* Please note, if a connection is opened, it will continue to be kept active in the thread until a client acknowledges
*
* @param hostname the Client hostname
* @param tcpPort the Client port
*/
public static void peerTCPServer(String hostname, int tcpPort) {
FLAG_State = "Server";
try {
@SuppressWarnings("resource")
ServerSocket welcomeSocket = new ServerSocket(tcpPort);
printMessage("TCP Server started. Waiting for incoming requests...");
while (true) {
Socket connectionSocket = welcomeSocket.accept();
Thread t1 = new Thread(() -> {
try {
electionCounter = 0;
String clientSentence;
StringBuilder capitalizedSentence;
BufferedReader inFromClient = new BufferedReader(new InputStreamReader(connectionSocket.getInputStream()));
DataOutputStream outToClient = new DataOutputStream(connectionSocket.getOutputStream());
while (!connectionSocket.isClosed()) {
try {
clientSentence = inFromClient.readLine();
if (clientSentence != null) {
if (clientSentence.startsWith("01")) {
String IPAddress = clientSentence.split("-")[1].split(":")[0];
String clientPort = clientSentence.split("-")[1].split(":")[1];
//01-127.128.52.36:3213-4
try {
ArrayList<String> peers = peerReadFile();
capitalizedSentence = new StringBuilder("02-" + IDCounter++ + "-");
if (clients.size() > 2) {
Collections.shuffle(clients);
}
for (int i = 0; i < clients.size() && i < 2; i++) {
capitalizedSentence.append(clients.get(i)).append("-");
}
int notServedYet = 2 - clients.size();
for (int i = notServedYet; i > 0; i--) {
if (i == 1) {
capitalizedSentence.append("0.0.0.0:" + TCP_PORT);
} else {
capitalizedSentence.append("0.0.0.0:" + TCP_PORT + "-");
}
}
outToClient.writeBytes(capitalizedSentence + "\n");
outToClient.flush();
connectionSocket.close();
if (peers.get(0).equals(hostname + ":" + tcpPort)) {
if (!clients.contains(IPAddress + ":" + clientPort)) {
clients.add(IPAddress + ":" + clientPort);
}
}
} catch (Exception e) {
printMessage("The file contains no contents!");
}
} else if (clientSentence.startsWith("03")) {
String lineToRemove = clientSentence.split("-")[1];
peerExit(lineToRemove, hostname, tcpPort);
connectionSocket.close();
} else if (clientSentence.startsWith("04")) {
peerSearch(clientSentence, hostname, tcpPort, connectionSocket); //.split("-")[1]
} else if (clientSentence.startsWith("05")) {
printMessage("Reply received from: " + clientSentence.split("-")[1].split(":")[0]);
if (FLAG_Message) {
FLAG_Message = false;
outToClient.writeBytes(message + "\n");
outToClient.flush();
} else if (FLAG_Search) {
FLAG_Search = false;
printMessage("The ID you are looking for: " + clientSentence.split("-")[2] + " has the IP address: " + clientSentence.split("-")[1]);
//sendFile1(connectionSocket, searchWithMessageTransfer.get(Integer.parseInt(clientSentence.split("-")[2])));
connectionSocket.close();
} else if (FLAG_Networking) {
printMessage("The ID you are looking for: " + clientSentence.split("-")[2] + " has the IP address: " + clientSentence.split("-")[1]);
if (peerReadFile().get(0).equals(hostname + ":" + TCP_PORT)) {
clients.add(clientSentence.split("-")[1]);
}
outToClient.writeBytes("Thank you, for your message!");
outToClient.flush();
if (!FLAG_Networking_Timer) {
networkingTimer.schedule(networkingTimerTask = new TimerTask() {
@Override
public void run() {
FLAG_Networking_Timer = false;
FLAG_Networking = false;
System.out.println("TimerTask stopped");
}
}, 5000);
} else {
timerTask.cancel();
networkingTimer.cancel();
FLAG_Networking = true;
FLAG_Networking_Timer = true;
networkingTimer.schedule(networkingTimerTask = new TimerTask() {
@Override
public void run() {
FLAG_Networking_Timer = false;
FLAG_Networking = false;
System.out.println("TimerTask stopped!");
}
}, 5000);
}
connectionSocket.close();
}
} else if (clientSentence.startsWith("06")) {
checkElection(clientSentence, connectionSocket, hostname, tcpPort);
} else if (clientSentence.startsWith("07")) {
increaseElectionCounter(connectionSocket, clientSentence);
} else if (clientSentence.startsWith("08")) {
receivedLeaderElectionMessage(connectionSocket, clientSentence);
} else if (clientSentence.startsWith("102-")) {
//102-Filename-Content
printMessage("Received file: " + clientSentence.split("-")[1]);
System.out.println(clientSentence);
receiveFile(clientSentence);
} else if (clientSentence.startsWith("100-")) {
//100-filename-hostname-system time
clientFileMessage(connectionSocket, clientSentence);
} else if (clientSentence.startsWith("101-")) {
//101.hostname:Port-filename-systemtime
} else if (clientSentence.startsWith("150-")) {
berkleyFlagCheck(connectionSocket, clientSentence);
} else if (clientSentence.startsWith("151-")) {
berkleyList.add(clientSentence.split("-")[1] + "-" + clientSentence.split("-")[2] + "-" + clientSentence.split("-")[3]);
} else if (clientSentence.startsWith("152-")) {
calculateExtraTime(clientSentence);
} else {
boolean connectionStayOpen = false;
boolean neighborStatus = false;
for (int n = 0; n < neighborSockets.size(); n++) {
if (neighborSockets.get(n).isClosed()) {
neighbours.remove(n);
neighborSockets.remove(n);
}
if (neighborSockets.get(n).getInetAddress().equals(connectionSocket.getInetAddress()) && neighborSockets.get(n).getPort() == connectionSocket.getPort()) {
neighborStatus = true;
connectionStayOpen = true;
}
}
if (!neighborStatus && neighborSockets.size() < 4) {
neighbours.add(connectionSocket.getInetAddress().toString().substring(1) + ":" + connectionSocket.getPort());
neighborSockets.add(connectionSocket);
connectionStayOpen = true;
}
printMessage("Message from Client(" + connectionSocket.getInetAddress() + ") received: " + clientSentence);
String capitalizedSentence1 = clientSentence.toUpperCase() + '\n';
try {
checkDuplicatedSearings(connectionSocket, outToClient, capitalizedSentence1);
if (!connectionStayOpen) {
connectionSocket.close();
}
} catch (IOException e) {
printMessage("Message could not be sent!");
}
}
} else throw new IOException();
} catch (IOException io) {
peerConnectionClosed(connectionSocket, hostname, tcpPort);
break;
}
}
} catch (Exception e) {
printMessage("The address " + connectionSocket.getInetAddress() + ":" + connectionSocket.getPort() + " could not establish a connection.");
}
});
t1.start();
}
} catch (Exception e) {
System.out.println("Exception triggered! " + e.getMessage());
}
}
private static void calculateExtraTime(String clientSentence) {
LocalTime extraTime = LocalTime.parse(clientSentence.split("-")[1]);
systemTime = systemTime.plusHours(extraTime.getHour());
systemTime = systemTime.plusMinutes(extraTime.getMinute());
systemTime = systemTime.plusSeconds(extraTime.getSecond());
printMessage("--------------------");
printMessage("Local time is now " + systemTime + "!");
printMessage("(change by: " + extraTime + " Time units)");
printMessage("--------------------");
FLAG_SyncStart = false;
}
private static void berkleyFlagCheck(Socket connectionSocket, String clientSentence) throws IOException {
if (!FLAG_SyncStart) {
FLAG_SyncStart = true;
//150-IP:Port-Systime-TTL
sendBerkleyAnswer(clientSentence.split("-")[1].split(":")[0], Integer.parseInt(clientSentence.split("-")[1].split(":")[1]), LocalTime.parse(clientSentence.split("-")[2]));
sendBerkleyNeighbor(clientSentence.split("-")[1].split(":")[0], Integer.parseInt(clientSentence.split("-")[1].split(":")[1]),
Integer.parseInt(clientSentence.split("-")[3]) - 1, connectionSocket, clientSentence.split("-")[2]);
}
}
private static void clientFileMessage(Socket connectionSocket, String clientSentence) {
String tmp = "The Client: " + clientSentence.split("-")[2] + " has the file: " + clientSentence.split("-")[1];
if (!tmp.equals(tmpReceived)) {
printMessage(tmp);
sendFileInformation(clientSentence.split("-")[1], clientSentence.split("-")[2], Integer.parseInt(clientSentence.split("-")[3]) - 1, connectionSocket);
tmpReceived = tmp;
}
}
private static void increaseElectionCounter(Socket connectionSocket, String clientSentence) {
if (Integer.parseInt(clientSentence.split("-")[1]) > ID) {
electionCounter++;
}
if (Integer.parseInt(clientSentence.split("-")[1]) > highestElectID) {
highestElectID = Integer.parseInt(clientSentence.split("-")[1]);
sendHighestIDToNeighbours(highestElectID, connectionSocket);
}
}
/**
* send the answer of the berkly algorithm
*
* @param hostname the local hostname
* @param port the local port
* @param systemTime the local system time
* @throws IOException by not founding the file
*/
private static void sendBerkleyAnswer(String hostname, int port, LocalTime systemTime) throws IOException {
Socket socket = new Socket(hostname, port);
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
LocalTime hourDifference;
boolean isMinus = false;
LocalTime secondDifference = systemTime.minusSeconds(p2pClient.systemTime.getSecond());
LocalTime minuteDifference = secondDifference.minusMinutes(p2pClient.systemTime.getMinute());
hourDifference = minuteDifference.minusHours(p2pClient.systemTime.getHour());
LocalTime initial = LocalTime.parse("00:00:00");
//24:00:00 - deviation that was mentioned.
LocalTime secondDifference1 = initial.minusSeconds(hourDifference.getSecond());
LocalTime minuteDifference1 = secondDifference1.minusMinutes(hourDifference.getMinute());
LocalTime hoursDifference = minuteDifference1.minusHours(hourDifference.getHour());
if (p2pClient.systemTime.isAfter(systemTime)) {
isMinus = true;
dos.writeBytes("151-" + p2pClient.hostname + ":" + p2pClient.TCP_PORT + "-" + hourDifference + "-" + isMinus + "\n");
} else {
dos.writeBytes("151-" + p2pClient.hostname + ":" + p2pClient.TCP_PORT + "-" + hoursDifference + "-" + isMinus + "\n");
}
}
/**
* exit a peer of the net
*
* @param lineToRemove the peer IP:Port message to remove in the file
* @param hostname the local hostname
* @param tcpPort the local port
*/
private synchronized static void peerExit(String lineToRemove, String hostname, int tcpPort) {
try {
for (int k = 0; k < neighbours.size(); k++) {
if (neighbours.get(k).equals(lineToRemove)) {
neighbours.remove(k);
neighborSockets.get(k).close();
neighborSockets.remove(k);
}
}
String leader = peerReadFile().get(0);
if (lineToRemove.equals(leader.split(":")[0])) {
sendlectionRequest(hostname, tcpPort);
for (int k = 0; k < clients.size(); k++) {
if (clients.get(k).equals(lineToRemove)) {
clients.remove(k);
}
}
}
printMessage(lineToRemove + " has left the network");
} catch (Exception e) {
printMessage("The registered leader is unknown.");
}
}
/**
* Second socket endpoint (Server --> Client). Here the client listens for messages from the server. is required, otherwise no bidirectional communication can take place.
*
* @param connectionSocket the connection socket
* @param outToClient the DataOutputStream
* @param inFromClient optional the DataInputStream
* @param tcpPort the Peer-TCP-Port
* @param hostname the Peer-TCP-Hostname
*/
private static void listenToServerRequest(Socket connectionSocket, DataOutputStream outToClient, DataInputStream inFromClient, int tcpPort, String hostname) {
try {
printMessage("Listener for Peer (" + connectionSocket.getInetAddress() + ":" + connectionSocket.getPort() + ") opened");
String clientSentence;
while (!connectionSocket.isClosed()) {
try {
BufferedReader br = new BufferedReader(new InputStreamReader(new DataInputStream(connectionSocket.getInputStream())));
clientSentence = br.readLine();
if (clientSentence != null) {
if (clientSentence.startsWith("03")) {
//peerExit(clientSentence.split("-")[1], outToClient, hostname, tcpPort);
//connectionSocket.close();
} else if (clientSentence.startsWith("04")) {
peerSearch(clientSentence, hostname, tcpPort, connectionSocket);
} else if (clientSentence.startsWith("05")) {
printMessage("Reply received from: " + clientSentence.split("-")[1].split(":")[0]);
if (FLAG_Message) {
FLAG_Message = false;
outToClient.writeBytes(message + "\n");
outToClient.flush();
} else if (FLAG_Search) {
FLAG_Search = false;
printMessage("The ID you are looking for: " + clientSentence.split("-")[2] + " has the IP address: " + clientSentence.split("-")[1]);
connectionSocket.close();
}
} else if (clientSentence.startsWith("06")) {
checkElection(clientSentence, connectionSocket, hostname, tcpPort);
} else if (clientSentence.startsWith("07")) {
increaseElectionCounter(connectionSocket, clientSentence);
} else if (clientSentence.startsWith("08")) {
receivedLeaderElectionMessage(connectionSocket, clientSentence);
} else if (clientSentence.startsWith("102-")) {
//102-Filename-Content
printMessage("Received file: " + clientSentence.split("-")[1]);
receiveFile(clientSentence);
} else if (clientSentence.startsWith("100-")) {
//100-filename-hostname
clientFileMessage(connectionSocket, clientSentence);
} else if (clientSentence.startsWith("101-")) {
//101.hostname:Port-filename
} else if (clientSentence.startsWith("150-")) {
berkleyFlagCheck(connectionSocket, clientSentence);
} else if (clientSentence.startsWith("151")) {
berkleyList.add(clientSentence.split("-")[1] + "-" + clientSentence.split("-")[2] + "-" + clientSentence.split("-")[3]);
} else if (clientSentence.startsWith("152-")) {
calculateExtraTime(clientSentence);
} else {
printMessage("Message from Client(" + connectionSocket.getInetAddress() + ") received: \n\t" + clientSentence);
String capitalizedSentence1 = clientSentence.toUpperCase() + '\n';
try {
checkDuplicatedSearings(connectionSocket, outToClient, capitalizedSentence1);
} catch (IOException e) {
printMessage("Message could not be sent!");
}
}
} else throw new IOException();
} catch (IOException io) {
if (!FLAG_State.equalsIgnoreCase("Connecting")) {
peerConnectionClosed(connectionSocket, hostname, tcpPort);
break;
} else {
for (int i = 0; i < neighborSockets.size(); i++) {
if (neighborSockets.get(i).getInetAddress().equals(connectionSocket.getInetAddress()) && neighborSockets.get(i).getPort() == connectionSocket.getPort()) {
connectionSocket.close();
neighborSockets.remove(i);
neighbours.remove(i);
}
}
}
}
}
} catch (Exception e) {
System.out.println("ERROR in listenToServerRequest(): " + e.getMessage());
e.printStackTrace();
}
}
private static void checkDuplicatedSearings(Socket connectionSocket, DataOutputStream outToClient, String capitalizedSentence1) throws IOException {
boolean wasSent = false;
for (int i = 0; i < messageIP.size(); i++) {
if (messageIP.get(i).equals(connectionSocket.getInetAddress() + ":" + connectionSocket.getPort())) {
wasSent = true;
messageIP.remove(i);
}
}
if (!wasSent) {
outToClient.writeBytes(capitalizedSentence1);
outToClient.flush();
}
}
/**
* Method that is called, as soon as an 08 message arrives
*
* @param connectionSocket the connection socket
* @param clientSentence the message of the election
*/
private static synchronized void receivedLeaderElectionMessage(Socket connectionSocket, String clientSentence) {
if (!LeaderMessage.equals(clientSentence.split("-")[1])) {
if (FLAG_Election_started) {
FLAG_Election_started = false;
timerTask.cancel();
timer.cancel();
timer.purge();
timer = new Timer();
}
electionCounter = 0;
highestElectID = -1;
FLAG_Election_started = false;
LeaderMessage = clientSentence.split("-")[1];
printMessage("--------------------");
printMessage("The new leader is now " + LeaderMessage + "!");
printMessage("--------------------");
sendElectionFinishedInformation(clientSentence.split("-")[1].split(":")[0], Integer.parseInt(clientSentence.split("-")[1].split(":")[1]),
Integer.parseInt(clientSentence.split("-")[2]), connectionSocket.getInetAddress().toString(), connectionSocket.getPort());
}
}
/**
* sends the message 100- (file updated) to the neighbours, with socket by the sender from whom we received the message is not informed again.
*
* @param filename the filename
* @param hostname the host name defined by IP:Port
* @param ttl the time to live, so that the packages do not circulate forever
* @param socket the socket where the info came in!
*/
private synchronized static void sendFileInformation(String filename, String hostname, int ttl, Socket socket) {
if (ttl > 0) {
for (Socket neighbour : neighborSockets) {
if (socket != null) {
if (!(neighbour.getInetAddress().equals(socket.getInetAddress()) && neighbour.getPort() == socket.getPort())) {
try {
DataOutputStream dos = new DataOutputStream(neighbour.getOutputStream());
dos.writeBytes("100-" + filename + "-" + hostname + "-" + ttl + "\n");
dos.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
} else {
try {
DataOutputStream dos = new DataOutputStream(neighbour.getOutputStream());
dos.writeBytes("100-" + filename + "-" + hostname + "-" + ttl + "\n");
dos.flush();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
/**
* send highest ID to neighbours
*
* @param id the highest ID
* @param connectionSocket the connection socket
*/
private synchronized static void sendHighestIDToNeighbours(int id, Socket connectionSocket) {
try {
for (Socket s : neighborSockets) {
if (!s.getInetAddress().equals(connectionSocket.getInetAddress())) {
if (!s.isClosed()) {
DataOutputStream dos = new DataOutputStream(s.getOutputStream());
dos.writeBytes("07-" + id + "\n");
dos.flush();
}
}
}
} catch (IOException io) {
printMessage("No neighbours available!");
}
}
/**
* check the election by preventing issues with the election
*
* @param clientSentence the message
* @param connectionSocket the socket of the connection
* @param hostname the client hostname
* @param tcpPort the client port
* @throws Exception by not founding the file
*/
private synchronized static void checkElection(String clientSentence, Socket connectionSocket, String hostname, int tcpPort) throws Exception {
int electionID = Integer.parseInt(clientSentence.split("-")[2]);
if (electionID > highestElectID) {
if (ID > electionID) {
send07toClientSentenceIP(clientSentence, ID);
//send new Election Message to your neighbors with your ID
for (int i = 0; i < neighborSockets.size(); i++) {
sendlectionRequest(hostname, tcpPort);
}
} else {
if (Integer.parseInt(clientSentence.split("-")[3]) > 0) { //TTL
for (Socket neighborSocket : neighborSockets) {
if (!connectionSocket.getInetAddress().equals(neighborSocket.getInetAddress())) {
//forward message to all neighbours, except the already requested client!
Socket ns = neighborSocket;
DataOutputStream dos = new DataOutputStream(ns.getOutputStream());
String param1 = clientSentence.split("-")[1];
String param2 = clientSentence.split("-")[2];
int param3 = Integer.parseInt(clientSentence.split("-")[3]);
--param3;
dos.writeBytes("06-" + param1 + "-" + param2 + "-" + param3 + "\n");
dos.flush();
}
}
}
}
} else {
send07toClientSentenceIP(clientSentence, highestElectID);
}
}
/**
* send a return message of the election to the message ip
*
* @param clientSentence the message to send
* @param highestElectID the temporary highest ID which was found
* @throws IOException by not founding the file
*/
private synchronized static void send07toClientSentenceIP(String clientSentence, int highestElectID) throws IOException {
Socket socket = new Socket(clientSentence.split("-")[1].split(":")[0], Integer.parseInt(clientSentence.split("-")[1].split(":")[1]));
DataOutputStream outToElectionTrigger = new DataOutputStream(socket.getOutputStream());
outToElectionTrigger.writeBytes("07-" + highestElectID + "\n");
outToElectionTrigger.flush();
socket.close();
}
/**
* check weather a client is disconnected or not
*
* @param socket the socket of the peer
* @param hostname the hostname of the peer
* @param port the port of the peer
* @throws Exception by having issues with the neighbors
*/
private synchronized static void peerConnectionClosed(Socket socket, String hostname, int port) throws Exception {
boolean isLeader = false;
try {
String leader = peerReadFile().get(0);
for (int i = 0; i < neighborSockets.size(); i++) {
if (socket.getInetAddress().equals(neighborSockets.get(i).getInetAddress()) && socket.getPort() == neighborSockets.get(i).getPort()) {
neighborSockets.get(i).close();
String oldNeighbor = neighbours.get(i);
neighborSockets.remove(i);
neighbours.remove(i);
if (leader.split(":")[0].equals(oldNeighbor.split(":")[0])) {
sendlectionRequest(hostname, port);
isLeader = true;
}
if (!isLeader) {
Socket leaderSocket = new Socket(leader.split(":")[0], Integer.parseInt(leader.split(":")[1]));
DataOutputStream dos = new DataOutputStream(leaderSocket.getOutputStream());
dos.writeBytes("03-" + socket.getInetAddress() + ":" + socket.getPort() + "\n");
leaderSocket.close();
}
}
}
} catch (Exception e) {
//printMessage("The registered leader is unknown.");
}
}
/**
* peerSearch method checks if he himself is the client you are looking for, if he is not, he sends the request to his neighbours
*
* @param clientSentence the incoming message
* @param hostname the IP address of this client
* @param tcpPort the TCP port of this client
* @param connectionSocket the ConnectionSocket on which the request came in
* @throws IOException by reading the file
*/
public synchronized static void peerSearch(String clientSentence, String hostname, int tcpPort, Socket connectionSocket) throws IOException {
String requesterIp = clientSentence.split("-")[2].split(":")[0];
int requesterPort = Integer.parseInt(clientSentence.split("-")[2].split(":")[1]);
int id = Integer.parseInt(clientSentence.split("-")[1]);
if (Integer.parseInt(clientSentence.split("-")[1]) == ID) {
printMessage("I was wanted!");
try {
Socket socket = new Socket(clientSentence.split("-")[2].split(":")[0], Integer.parseInt(clientSentence.split("-")[2].split(":")[1]));
DataOutputStream dos = new DataOutputStream(socket.getOutputStream());
dos.writeBytes("05-" + hostname + ":" + tcpPort + "-" + ID + "\n");
dos.flush();
BufferedReader br = new BufferedReader(new InputStreamReader(new DataInputStream(socket.getInputStream())));
try {
String msg = br.readLine();
printMessage("Message from Client(" + socket.getInetAddress() + ") received (search): \n\t" + msg);
} catch (Exception e) {
//printMessage("The client has disconnected.");
}
} catch (Exception e) {
printMessage("The Client " + clientSentence.split("-")[2].split(":")[0] + ":" + Integer.parseInt(clientSentence.split("-")[2].split(":")[1]) + " has left the net!");
}
} else {
int TTL = Integer.parseInt(clientSentence.split("-")[3]) - 1;
if (TTL > 0) {
sendSearchMessageToNeighbours(id, requesterIp, requesterPort, TTL, connectionSocket);
}
}
}